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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (c) 1994-1997, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org) * Copyright (c) 1999, 2000 Silicon Graphics, Inc. */ #include <linux/bitops.h> #include <linux/bits.h> #include <linux/irqflags.h> #include <linux/export.h> /** * __mips_set_bit - Atomically set a bit in memory. This is called by * set_bit() if it cannot find a faster solution. * @nr: the bit to set * @addr: the address to start counting from */ void __mips_set_bit(unsigned long nr, volatile unsigned long *addr) { volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; mask = 1UL << bit; raw_local_irq_save(flags); *a |= mask; raw_local_irq_restore(flags); } EXPORT_SYMBOL(__mips_set_bit); /** * __mips_clear_bit - Clears a bit in memory. This is called by clear_bit() if * it cannot find a faster solution. * @nr: Bit to clear * @addr: Address to start counting from */ void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr) { volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; mask = 1UL << bit; raw_local_irq_save(flags); *a &= ~mask; raw_local_irq_restore(flags); } EXPORT_SYMBOL(__mips_clear_bit); /** * __mips_change_bit - Toggle a bit in memory. This is called by change_bit() * if it cannot find a faster solution. * @nr: Bit to change * @addr: Address to start counting from */ void __mips_change_bit(unsigned long nr, volatile unsigned long *addr) { volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; mask = 1UL << bit; raw_local_irq_save(flags); *a ^= mask; raw_local_irq_restore(flags); } EXPORT_SYMBOL(__mips_change_bit); /** * __mips_test_and_set_bit_lock - Set a bit and return its old value. This is * called by test_and_set_bit_lock() if it cannot find a faster solution. * @nr: Bit to set * @addr: Address to count from */ int __mips_test_and_set_bit_lock(unsigned long nr, volatile unsigned long *addr) { volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; int res; mask = 1UL << bit; raw_local_irq_save(flags); res = (mask & *a) != 0; *a |= mask; raw_local_irq_restore(flags); return res; } EXPORT_SYMBOL(__mips_test_and_set_bit_lock); /** * __mips_test_and_clear_bit - Clear a bit and return its old value. This is * called by test_and_clear_bit() if it cannot find a faster solution. * @nr: Bit to clear * @addr: Address to count from */ int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr) { volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; int res; mask = 1UL << bit; raw_local_irq_save(flags); res = (mask & *a) != 0; *a &= ~mask; raw_local_irq_restore(flags); return res; } EXPORT_SYMBOL(__mips_test_and_clear_bit); /** * __mips_test_and_change_bit - Change a bit and return its old value. This is * called by test_and_change_bit() if it cannot find a faster solution. * @nr: Bit to change * @addr: Address to count from */ int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr) { volatile unsigned long *a = &addr[BIT_WORD(nr)]; unsigned int bit = nr % BITS_PER_LONG; unsigned long mask; unsigned long flags; int res; mask = 1UL << bit; raw_local_irq_save(flags); res = (mask & *a) != 0; *a ^= mask; raw_local_irq_restore(flags); return res; } EXPORT_SYMBOL(__mips_test_and_change_bit); |